While trying to buy Gleam Club 180 today i was told to use the steam overlay.
This is not working for me in boundless at all, but does work in all my other steam games.
I have the funds available, my steam account is set to online, restarted teh game and steam, but still nothing.
I only have 2 weeks left on the club.
This probably won’t help, but I’d suggest letting Steam check/verify/fix your Boundless files. Especially since you say this only happens in Boundless and not with any other games. Then I’d restart both of them.